Microsoft Single Sign On service missing

Case :Microsoft Single Sign On service missing

To enable SSO functionality for Office SharePoint Server 2007, you need to start the Microsoft Single Sign-On service and then manage SSO settings in the SharePoint Central Administration Web application.

Start the Single Sign-On service on all front-end Web servers and all application servers in your farm that run Excel Calculation Services.
Steps to start it: 
Start -> Run -> Services.msc -> Locate Microsoft Single Sign-On Service -> On the Log On tab of the Single Sign-On Service Properties page, click This account, and then type the domain, user name, and password that you have used to install and manage your server. -> Click Apply. -> change the start up type to Automatic, click Start, and then click OK.

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